100% CPU usage #11
Comments
|
What version of s2a_fm and pymata are you using? Are you running this on a PC or something like Raspberry Pi. If on a PC, what CPU are you using and how much RAM do you have? |
|
I cloned your current master branch and tested it, Pymata 2.10, pyserial On 26.10.2015 22:14, Alan Yorinks wrote:
|
|
Thanks for the info. I will be away from my computer for the next few days. I will investigate and get back to you later this week. Are you running Windows and what version of Python are you using? On October 27, 2015, at 8:36 AM, Mirko notifications@github.com wrote: I cloned your current master branch and tested it, Pymata 2.10, pyserial On 26.10.2015 22:14, Alan Yorinks wrote:
— |
|
Alright, I am using it on Linux ( Arch Linux) using it with python 2.7. On 27.10.2015 14:41, Alan Yorinks wrote:
|
|
No need to check it on Windows since I run linux myself. Windows most likely will not be an improvement. Is Python 2.7.10 or an earlier version? On October 27, 2015, at 9:45 AM, Mirko notifications@github.com wrote: Alright, I am using it on Linux ( Arch Linux) using it with python 2.7. On 27.10.2015 14:41, Alan Yorinks wrote:
— |
|
Alright then. Do you have this skyrocketing CPU-Usage? On 27.10.2015 14:49, Alan Yorinks wrote:
|
|
The last I checked it was much less than 100%. I am going to download and install from scratch and will get back to you later in the week. On October 27, 2015, at 9:52 AM, Mirko notifications@github.com wrote: Alright then. Do you have this skyrocketing CPU-Usage? On 27.10.2015 14:49, Alan Yorinks wrote:
— |
|
Thank you! On 27.10.2015 17:26, Alan Yorinks wrote:
|
|
I got back earlier than I originally thought I would, so I was able to run the program and get some results. First, let me share what my system is: When I run the system monitor, the average CPU utilization across all cores is reported at between 38-40% (across all cores). If I look at the individual cores, on occasion, I do see a short 100% peak on one of the cores, but this peak appears on random cores while the other 3 are pretty close to idle. I am able to run other programs while s2a_fm is up and running without issues (the browser, libre office, etc.). Is the 100% you are seeing on average or peaking on a single core? Also, are you locked out of access to other programs as a result? What tool are you using to monitor CPU utilization? BTW, If I run "top", I see a consistent total usage of 145%. If all 4 cores were fully occupied, then I would see 400 %. |
|
Well, It is not an overall 100% its just one Core is at 100% even tough On 28.10.2015 00:00, Alan Yorinks wrote:
|
|
Ok, you had me worried. The program is actually running as expected. The reason for the high percentage is that there is a thread running in a tight loop looking for characters to come in from the Arduino (this is in pymata). Because both pymata and s2a_fm are multithreaded, the overall throughput performance (handling data bidirectionally for the Arduino and Scratch program) is pretty good, but CPU utilization is relatively high. Python has a limitation in running threads. The global interpreter lock (GIL) prevents multiple threads running simultaneously, and threads cannot be distributed amongst the cores. Just a fact of life. Dave Beazly does a nice job describing this. Recently I have used the asyncio library in another project and in the second generation of pymata (it's called pymata-aio). Running similar applications and comparing the 2 libraries, PyMata shows the same performance as described in a previous comment (~35-40%). When I run pymata-io, the average performance drops from 35% to 4% and no core ever runs at 100%. It is not multi-threaded, but uses event driven asyncio, a much more efficient way of handling concurrency. I am thinking of porting s2a_fm to asyncio (no decision yet). The pymata end is already done, and being used in other Scratch projects rb4s. Stay tuned. Is it ok for me to close this issue? |
|
Anything to enhance s2a will be welcomed ! :-D |
|
@SebCanet Ok, you convinced me. I will take a look at porting it. ;-). I am not sure what is entailed yet, but hopefully it shouldn't be too bad. |
|
Yahou !!!! Thanks a lot ! |
|
@SebCanet If I document the new program on a github wiki instead of providing a user's manual, would it make things easier for you, since the wiki pages can be translated in the browser? All of the block translations should remain the same and the current Scratch files should continue to work. Also, the latest pymata (pymata-aio) auto detects com ports. I will try to have the program auto launch Scratch. |
|
Thank you for explaining this behavior! It would be really appriciated if you port it to the async PyMata lib. |
|
@mirko314, @SebCanet I just ran a prototype version of s2a_fm using Python asyncio (I am calling the new version s2aio). You can see the results here. The good news is that you can continue to develop Scratch programs using the current s2a_fm and these programs should be able to be used without modification when s2aio becomes available (at least that is the goal). Thanks Mirko for bringing this issue up. |
|
Thansk for everything !!! That' exactly in this way of mind that I created my "s2a control panel", modular way. |
Hello,
I am getting 100% CPU usage when I start the script. It Starts aber the Board was detected and does not end, even though the script is more or less idling and waiting for scratch to start.
Using it on Arch Linux, but should not make a huge difference!
Greetings,
Mirko
The text was updated successfully, but these errors were encountered: